Crista supracondylaris lateralis

Crista supracondylaris lateralis

The Crista supracondylaris lateralis is a bony ridge located on the lateral side of the distal end of the humerus bone in the upper arm. It serves as an attachment site for various muscles and ligaments.

Anatomy

The crista supracondylaris lateralis is a prominent ridge that extends horizontally on the lateral side of the distal end of the humerus. It is located just above the lateral epicondyle, which is another bony prominence on the humerus. The crista supracondylaris lateralis runs parallel to the shaft of the humerus and provides attachment points for several important structures.

Function

The crista supracondylaris lateralis serves as an attachment site for various muscles and ligaments involved in the movement of the elbow joint and the forearm. Some of the key structures that attach to this ridge include:

• Brachioradialis muscle: This muscle originates from the crista supracondylaris lateralis and inserts into the styloid process of the radius bone. It plays a role in flexing the forearm at the elbow joint.

• Extensor carpi radialis longus muscle: This muscle also originates from the crista supracondylaris lateralis and inserts into the base of the second metacarpal bone. It is involved in extending and abducting the wrist joint.

• Lateral collateral ligament: This ligament attaches to the crista supracondylaris lateralis and provides stability to the lateral side of the elbow joint.

Clinical Significance

In some cases, the crista supracondylaris lateralis may develop bony prominences or spurs, which can cause pain and discomfort. This condition is known as supracondylar process syndrome. It can result in compression of the median nerve, leading to symptoms such as numbness, tingling, and weakness in the hand and fingers. Treatment options for this condition may include conservative measures such as rest, physical therapy, and pain management, or in severe cases, surgical intervention.

See Also

• Humerus
• Elbow joint
• Brachioradialis muscle
• Extensor carpi radialis longus muscle
• Lateral collateral ligament